Integration test dependency fix (#38)

* Remove browserless integration test files

Deleted the _test_browserless integration test directory, including its configuration, test script, and package manifest. This cleans up unused or obsolete test code and dependencies.

* Update funding, README, and troubleshooting docs

Added Tidelift funding link. Improved README by reorganizing and clarifying worker configuration and troubleshooting sections. Enhanced troubleshooting guide with ESM and CJS examples for DOMMatrix errors and fixed a test workflow link.

Author: mehmet-kozan

.github/FUNDING.yml

@@ -1 +1,2 @@
 github: mehmet-kozan
+tidelift: npm/pdf-parse

README.md

@@ -297,7 +297,7 @@ try {
 - **Live Demo:** [`https://mehmet-kozan.github.io/pdf-parse/`](https://mehmet-kozan.github.io/pdf-parse/)
 - **Demo Source:** [`reports/demo`](reports/demo)
 - **ES Module**:  `pdf-parse.es.js` **UMD/Global**: `pdf-parse.umd.js`
-- For browser build, set the [`background web worker`](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers) explicitly.
+- For browser build, set the `web worker` explicitly.
 
 ### CDN Usage
 
@@ -332,17 +332,6 @@ try {
 - `https://cdn.jsdelivr.net/npm/pdf-parse@latest/dist/pdf-parse/web/pdf.worker.min.mjs`
 
 
-## Worker Configuration & Troubleshooting
-
-See [docs/troubleshooting.md](./docs/troubleshooting.md) for detailed troubleshooting steps and worker configuration for Node.js and serverless environments.
-
-- Worker setup for Node.js, Next.js, Vercel, AWS Lambda, Netlify, Cloudflare Workers
-- Common error messages and solutions
-- Manual worker configuration for custom builds and Electron/NW.js
-- Node.js version compatibility
-
-If you encounter issues, please refer to the [Troubleshooting Guide](./docs/troubleshooting.md).
-
 ## Similar Packages
 
 * [pdf2json](https://www.npmjs.com/package/pdf2json) — Buggy, memory leaks, uncatchable errors in some PDF files.
@@ -366,6 +355,17 @@ Integration tests run on Node.js 20–24, see [`test_integration.yml`](./.github
 
 Requires additional setup see [docs/troubleshooting.md](./docs/troubleshooting.md).
 
+## Worker Configuration & Troubleshooting
+
+See [docs/troubleshooting.md](./docs/troubleshooting.md) for detailed troubleshooting steps and worker configuration for Node.js and serverless environments.
+
+- Worker setup for Node.js, Next.js, Vercel, AWS Lambda, Netlify, Cloudflare Workers.
+- Common error messages and solutions.
+- Manual worker configuration for custom builds and Electron/NW.js.
+- Node.js version compatibility.
+
+If you encounter issues, please refer to the [Troubleshooting Guide](./docs/troubleshooting.md).
+
 ## Contributing
 
  When opening an issue, please attach the relevant PDF file if possible. Providing the file will help us reproduce and resolve your issue more efficiently. For detailed guidelines on how to contribute, report bugs, or submit pull requests, see: [`contributing to pdf-parse`](https://github.com/mehmet-kozan/pdf-parse?tab=contributing-ov-file#contributing-to-pdf-parse)

docs/troubleshooting.md

@@ -6,6 +6,7 @@ This guide provides solutions to common issues encountered when using `pdf-parse
 ## 1. DOMMatrix is not defined
 This error occurs when DOMMatrix is not available in the Node.js environment. To fix:
 
+ESM
 ```js
 // Import this before importing "pdf-parse"
 import { CanvasFactory } from 'pdf-parse/worker';
@@ -14,6 +15,15 @@ import { PDFParse } from 'pdf-parse';
 const parser = new PDFParse({ data: buffer, CanvasFactory });
 ```
 
+CJS
+```js
+// Import this before importing "pdf-parse"
+const { CanvasFactory } = require ('pdf-parse/worker');
+const { PDFParse } = require ('pdf-parse');
+
+const parser = new PDFParse({ data: buffer, CanvasFactory });
+```
+
 ## 2. Error: require() of ES Module
 This happens when trying to require an ES module. Ensure you're using import statements or configure your environment to handle ES modules properly.
 
@@ -130,7 +140,7 @@ const parser = new PDFParse({ data: buffer, CanvasFactory });
 // then use parser
 ```
 
-Unsupported tests run on Node.js 18, 19, 21, see [`test_integration.yml`](../.github/workflows/test_unsupported.yml).
+Unsupported tests run on Node.js 18, 19, 21, see [`test_unsupported.yml`](../.github/workflows/test_unsupported.yml).
 
 ## General Advice
 - Ensure your deployment platform supports the required Node.js version and dependencies.